Wilson Jones Heavy Duty Round Ring Binder with Extra Durable Hinge, 3-Inch, Black (W364-49NB) Features our strongest binder covers and extra durable hinge for years of reliable use 3 inch round ring binder holds 600 sheets Custom formulated, PVC Free polypro material lasts up to 10X longer than vinyl Never-gap rings close tightly to keep papers secure Two interior pockets provide additional storage